JPH01295536A - Radio telephone set - Google Patents

Abstract

PURPOSE:To prevent crosstalk by allowing a mobile station to send a specific signal to a radio base station, setting the radio base station into an idle channel retrieval state and switching a talking channel to the selected idle channel. CONSTITUTION:If there is any possibility to cause crosstalk at talking, a key input means provided to a mobile station 10 is operated to send a specific signal to a radio base station 2. The radio base station 2 is set to the idle channel retrieval state in response to the specific signal and a data relating to the selected idle channel is sent to the mobile station via a talking channel in use at present and the mobile station is switched to the idle channel. Moreover, the key input means 16 provided to the mobile station is operated to send the specific signal to the radio base station via a band below the voice band of the talking channel.The reception circuit of the radio base station responses to the specific signal and is set in the idle channel retrieval state and the data relating the selected idle channel is sent to the mobile station via the band below the voice band of the talking channel in use at present and the mobile station is switched to the idle channel.

Description

[Detailed Description of the Invention] G) Industrial Application Field The present invention relates to a radio telephone device, and in particular a radio base station connected to a general subscriber telephone line, and a radio base station connected to a plurality of radio telephone lines. The present invention relates to a multi-channel access wireless telephone device that includes a mobile station connected to a mobile station, selects an empty channel from among a plurality of wireless channels, and transmits data regarding the channel via a control channel.

(b) Conventional technology In recent years, wireless base stations connected to general subscriber lines,
As a wireless telephone device equipped with this wireless base station and a mobile station capable of wireless communication, the output power is 10 mW or less and 20 to 50 F.
There is a low-power type that has a range of use of It.

This type of wireless telephone device uses a transmitting and receiving frequency band of 253.8.
625MHz ~ 2549625MHz and 58α2125
MHz~58t 5125MHz is given,
Furthermore, since the channel spacing is 12.5KH2, there are 88 channels in total. Of these, 254425
Since two channels, MHz and 2549625 MHz, are control channels, 86 channels can be used as communication channels.

This type of wireless telephone device will be explained with reference to FIG.

In Fig. 7, a) is a general subscriber telephone line, a concubine is a wireless base station, (3) is a line interface, (4) is an incoming call detection unit that detects incoming calls, and (5) is a device for passing voice signals. The filter (6) is a baseband section, and (7) is a filter that searches for an empty channel from among a plurality of wireless channels in response to the detection signal (Sl) from the incoming call detection section (4), and uses data regarding the channel as a base. A control unit (8) supplies the baseband information to the band unit (6) and controls various operations based on the baseband information contained in the received signal;
), the transmitting/receiving channel is changed in response to the control signal (S2) from the controller (S2), and the radio section supplies a signal (S5) regarding the level of the receiving channel to the control section (7), (9) is the transmitting/receiving antenna, α■ is Mobile station, C11l is a transmitting/receiving antenna, (1) is a radio section, (1) is a baseband section, (
14) is a control unit, σS is a filter, (1G is a key input unit for inputting a dial number, etc., and an is a transmitter/receiver unit.

Next, the operation will be explained.

If you receive a call from the general subscriber telephone line (1),
The incoming signal is supplied to the incoming call detection section (4) via the line interface 1)). When the incoming call detection section (4) detects an incoming call, a detection signal (Sl) is sent to the control section (4).
7).

The control unit (7) executes an empty channel search operation in response to the detection signal (Sl). Specifically, the control unit (
7) Radio section (8) in response to the control signal (Sl) of Rikishima et al.
Channel scanning is performed by changing the division ratio of the programmable frequency divider of the PI and L circuits that make up the
At the same time, by detecting the reception level on each channel, it is determined whether the channel is empty or not. Note that the determination of an empty channel is made based on whether the reception level is 2 μV or less.

After an empty channel is selected in this way, the control unit (7
) sends the frequency division ratio data of the control channel to the radio section (8), and also supplies data regarding the selected vacant channel to the baseband section (6), thereby transmitting the vacant channel to the mobile station via the control channel. Send data regarding.

Note that interference with other wireless telephone devices is prevented by attaching an identification number (ID code) unique to the wireless telephone device to the above data.

On the other hand, the mobile station derives baseband information from the received signal and supplies it to the control unit σa, and also transmits the division ratio of the channel corresponding to the data from the control unit I to the radio unit 11z.
By supplying the information to the channel, the state is set to enable communication on the channel.

After that, a paging signal is sent between the wireless base stations via the selected communication channel, and the mobile station is taken off-hook, thereby establishing a communication path between the general subscriber line (1) and the mobile station a. is formed.

When making a call from a mobile station, first call the wireless base station (
2) sends an off-hook signal.

On the other hand, when the off-hook signal is detected between wireless base stations, a vacant channel is searched for as in the case described above. If there is an empty channel, data regarding the channel is sent back to the mobile station. After the mobile station sets the call channel based on this returned data,
The dial signal is sent to the wireless base station via the corresponding call channel.■
Send to.

f9 Problems to be Solved by the Present Invention By the way, radio telephone devices have various problems because the range of radio waves changes depending on the environment in which they are used. For example, when a mobile station is used outdoors, the radio wave coverage is wide and there is a risk of interference with a third party using the same communication channel. The present invention aims to solve this problem.

2) Means for solving the problem In order to solve the above problem, the method comprises a wireless base station connected to a general subscriber telephone line, and a mobile station connected to this wireless base station through a plurality of wireless channels, A multi-channel access wireless telephone device that selects an empty channel from among a plurality of wireless channels and transmits data regarding the channel via a control channel; b-3
When making a call, a key input means provided on the mobile station is operated to send a specific signal to the wireless base station, thereby setting the wireless base station to the empty channel search state again and searching for the selected empty channel. It is an object of the present invention to provide a wireless telephone device which is characterized in that it transmits data related to a mobile station to a mobile station via a currently used communication channel, and then switches the communication channel.

In addition, a wireless base station connected to a general subscriber telephone line,
A multi-channel access type wireless phone that is equipped with this wireless base station and a mobile station connected through multiple wireless channels, selects an empty channel from among the multiple wireless channels, and transmits data related to that channel via a control channel. The device includes a radio base station equipped with a receiving circuit that detects only the reception level of the radio channel, and when making a call, operates a key input means provided on the mobile station to transmit a specific signal below the voice band of the communication channel. The receiving circuit of the wireless base station is controlled by transmitting the data to the wireless base station via the band of It is an object of the present invention to provide a wireless telephone device which is characterized in that it transmits information to a mobile station via a mobile station, thereby switching communication channels.

(e) Effect According to the present invention, when interference occurs or is likely to occur during a call, a specific signal is sent to the radio base station by operating the key input means provided on the mobile station. Send. The IIAa base station is set to an empty channel search state in response to such a specific signal. Furthermore, data regarding the vacant channel selected by the vacant channel search operation is sent to the mobile station via the currently used communication channel, and the mobile station is then switched to the communication channel.

Further, by operating a key input means provided on the mobile station, a specific signal is sent to the radio base station via a band below the voice band of the communication channel.

A receiving circuit provided in the wireless base station is set to an empty channel search state in response to such a specific signal. Further, data regarding the empty channel selected by the empty channel search operation is sent to the mobile station via a band lower than the voice band of the currently used communication channel, and the mobile station is switched to the corresponding communication channel.

(f) Embodiment FIG. 1 shows no l/31 according to the present invention! FIG. 2 is a diagram illustrating an embodiment of a radio base station of an E-phone device, and FIG. 2 is a diagram illustrating an embodiment of a mobile station. Incidentally, the same parts as in FIG. 7 are given the same reference numerals, and the explanation thereof will be omitted.

In FIGS. 1 and 2, aS+ is a mute circuit that is disposed on a signal transmission path and is controlled on/off in response to a control signal (s4) from a control unit (7), (I9 is a DTM
Tone datar section that converts the F signal into a digital signal, [
A mute circuit is disposed on the signal transmission path and is turned on and off in response to a control signal (s5) from the control unit α4.

Next, the operation will be explained with reference to the flowcharts of FIGS. 3 and 4. Note that FIG. 3 is a flowchart for the mobile station, and FIG. 4 is a flowchart for the wireless base station.

When using a wireless telephone device, if interference occurs or there is a risk of interference, enter a specific code number (e.g. 11) in the key field (161) (Step 1). , the control unit σ4 selects the DTM corresponding to the code number.
Send the F signal (step 2).

At the same time, the control section I outputs a control signal (S5) to turn on the output circuit (2) (step 5).

The DTMF signal is supplied to the radio section 1z via the filter C15 and the baseband section α3, and the radio section +12
The signal is modulated and amplified to the desired transmission level. Thereafter, the DTMF signal is transmitted to the wireless base station 1121 via the antenna aυ.

The radio base station (2) which receives the DTMF signal with the antenna (9) down-levels the transmission signal to a predetermined frequency in the radio section (8) and demodulates the DTMF signal. The DTMF signal demodulated in this way is sent to the baseband section (6).
The signal is supplied to the tone decoder section σ9 via the tone decoder section (1'l), and after being converted into a digital signal,
It is supplied to the control section (7).

The control unit (7) determines whether or not the digital signal is a specific signal that commands channel switching (step 8). If it is determined that the digital signal is a specific signal, first the control unit (7)
S4) and turns on the mute circuit U (step 9). Next, search for an empty channel (#) by changing the division ratio data supplied to the radio section (8) and detecting the reception level of the set communication channel.
Step 10).

As a result of such search, if there is an empty channel, data regarding the empty channel (for example, branch ratio data) is supplied to the radio unit (8) via the baseband unit (6),
The signal is modulated in the radio W (8) and amplified to a desired transmission level (step 12).

Thereafter, the data is transmitted via the currently used communication channel.

On the other hand, if there is no free channel, data indicating that there is no free channel is supplied to the radio section (8) via the baseband section (6) (step 15).

The mobile station (1 (
1 down-levels the transmission signal to a predetermined frequency and demodulates the data in the radio section α2. The data demodulated in this manner is supplied to the control section I via the baseband section (1).

The control unit σ2 determines whether the data is related to an empty channel or not (step 4), and if the data is related to an empty channel, it supplies the branching ratio corresponding to the data to the M-free unit σ2, and a new Switch to the call channel [Step 5]. At the same time, the polarity of the control signal (S5) is reversed to turn off the mute circuit C0 (step 6).

Therefore, the radio base 8(2) and the mobile station 1 can communicate using the new communication channel.

- 10,000, if data indicating that there are no free channels is received (step 4.7), the control unit I
The mute circuit (2) is turned off by inverting the polarity of the control signal (S5) without changing the frequency of the control signal (S5). That is, channel switching is not performed at this time.

Immediately or after a predetermined period of time after the aforementioned data transmission, the radio base station (2) sets the radio unit (8) to the selected communication channel (step 1) and turns off the mute circuit α ( Step 14).

Furthermore, when transmitting data indicating that there is no vacant channel, the mute circuit T181 is turned off after transmitting the data.

FIG. 5 is a diagram showing another embodiment of the radio base station of the radio telephone device according to the present invention, and FIG. 6 is a diagram showing another embodiment of the mobile station.

In Figures 5 and 6, CI! 11 is a control unit (7
) is a receiving circuit whose receiving frequency is changed according to the control signal (S6] from ), ■ is a receiving circuit (receiving level detection circuit that detects the level of the signal received at 211, @Δ is normal control data ( For example, 2.4Kbp of dial signal etc.
s data] with a cutoff frequency of 4KH2,
c2ic+J is an LPF with a cutoff frequency of 200 Hz that passes a specific signal (for example, 100 bp3 data).

Note that the filter in this example (51 (15 is 500 to 500)
It is a BPF with a passband of 1 KHz. Additionally, mute circuit α81 (2G has been deleted).

Next, the operation will be explained.

Key input section (1E9 to specify a specific code number (for example,
1], the control unit α sends out 100 bps digital data corresponding to the code number, and the digital data is supplied to the radio unit (121) via the filter @ baseband unit (1). The signal is then modulated and amplified to a desired transmission level in the radio section (1).

Thereafter, said digital data is transmitted to the radio base station via antenna 11).

By the way, as mentioned above, LPFC allows 100 bps digital data to pass through! 4 has a cutoff frequency of 200H
z, the digital data is within the call voice band (3
00-5KHz) or less.

The radio base station (2) which has received the digital data with the antenna (9) down-levels the transmission signal to a predetermined frequency in the radio section (8) and demodulates the digital data. The digital data thus demodulated is supplied to the control section (7) via the baseband section (6) and the LPF (24).

Note that the digital data is also supplied to the control unit (71) via the LPF (231), but for example, the control signal (S2) supplied from the control unit (71 to the radio unit (8)) indicates the frequency of the control channel. If the control unit (7) is set to select the signal that has passed through the LPFC!41 for information other than information (branch ratio), the digital data can be supplied with high accuracy.

The control unit +71 determines whether or not the digital data is a specific signal that commands channel switching, and if it is determined that the digital data is a specific signal, the control unit +71 transmits the control signal (81 to the circuit under test Q).
11 to change the division ratio data, and also to the receiving circuit.
The received level detection circuit detects the level of the signal received by the receiver, and searches for an empty channel.

During such a search, when the reception level detection circuit i23 detects that the reception level is 2 μV or less, the reception level detection circuit i23 supplies a detection signal (S7) to the control section (7).

In response to the detection signal (S7), the control unit (7) uses the division ratio data set in the receiving circuit Q11 as data regarding the vacant channel to LPFC! 41 and the baseband section (6) to the radio section (81), where it is modulated and amplified to a desired transmission level. transmitted over a band below the band.

On the other hand, if there is no free channel, data indicating that there is no free channel is supplied to the radio section (8).

Mobile station a1, which has received such data through antenna U, down-levels the transmission signal to a predetermined frequency and demodulates the data in the radio section (121).The data demodulated in this way is
Supplied to the control unit (■).

The control unit I determines whether the data is related to an empty channel or not, and if the data is related to an empty channel, it supplies the division ratio corresponding to the data to the radio unit (121) and switches to a new communication channel. .

Therefore, the radio base station (2) and the mobile station fi(l) can communicate using the new communication channel.

On the other hand, if data indicating that there is no free channel is received, the control unit I visually and/or audibly indicates that channel switching has not been performed without changing the frequency of the radio unit (1). to notify the public.

By the way, the present invention is not limited to the above-mentioned embodiment. For example, if a dedicated key for channel switching is provided, when there is no free channel, data indicating that there is no free channel is sent, and then a predetermined key is provided. It goes without saying that various changes can be made, such as searching for an empty channel every time.

(G) Effects of the Invention According to the present invention, during a call, by operating the t key input means provided in the mobile #J station, the wireless base station is switched to an empty channel by transmitting a specific signal to the wireless base station. Since the mobile station is set to the search state and the data regarding the selected vacant channel is sent to the mobile station via the currently used communication channel, and the communication channel is then switched, interference can be prevented. I can do it.

In addition, if the specific signal and data are sent out over a wide band below the voice band of the communication channel, and the wireless base station is provided with a receiving circuit that detects only the reception level, channel switching can be performed while the communication continues. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a radio base station of a radio telephone device according to the present invention, FIG. 2 is a diagram also showing an embodiment of a mobile station, and FIG. 3 is a 70-chart of the mobile station, FIG. 4 is a flowchart of a front-line base station, FIG. 5 is a diagram showing another embodiment of a wireless base station, FIG. 6 is a diagram showing another embodiment of a mobile station, and FIG. 7 is a diagram showing a conventional example. be. (7)... Wireless base station, (7)... Control unit, Concave... Transfer WjJ station, G41... Control unit, B... Receiving circuit, Device... Reception level detection circuit.

Claims (2)

[Claims] (1) A wireless base station connected to a general subscriber telephone line,
A multi-channel access type wireless phone that is equipped with this wireless base station and a mobile station connected through multiple wireless channels, selects an empty channel from among the multiple wireless channels, and transmits data related to that channel via a control channel. The device is configured to operate a key input means provided on the mobile station to send a specific signal to the wireless base station during a call, thereby setting the wireless base station again in an empty channel search state and selecting the selected wireless base station. What is claimed is: 1. A wireless telephone device that transmits data regarding a vacant channel to a mobile station via a currently used communication channel, thereby switching the communication channel. (2) a wireless base station connected to a general subscriber telephone line;
A multi-channel access type wireless phone that is equipped with this wireless base station and a mobile station connected through multiple wireless channels, selects an empty channel from among the multiple wireless channels, and transmits data related to that channel via a control channel. The device includes a radio base station equipped with a receiving circuit that detects only the reception level of the radio channel, and when making a call, operates a key input means provided on the mobile station to transmit a specific signal below the voice band of the communication channel. The receiving circuit of the wireless base station is controlled by transmitting the data to the wireless base station via the band of 1. A wireless telephone device that transmits data to a mobile station via a mobile station, thereby switching communication channels.